Mike,
In general, I agree with your points. OTOH, I have operated a charter boat what you suggest is not practical. People who've been out of the water that long (especially with such little experience to begin with) are usually a danger to themselves and anyone near by.
I was recently teaching a private wreck class, we were on our way to a moderately deep wreck (110' to the sand), when the DM pulled me aside to discuss his problem. Seems 2 guys were on board who had not been diving in 3 years. He was upset with the shop for putting them on the boat on this trip since they obviously needed a refresher and a less advanced dive to get back into diving. I suggested he have them sit out the dive.
He opted to dive with them instead (no extra fee, BTW, just trying to save their bacon).
As my student was setting up to enter the wreck, I saw some movement off to my right. Glancing over, I saw one of these guys all alone, in a vertical position, maintaining his depth by flapping his arms like a birds wings while bicycling like crazy.
I signaled to him, asking, Where is your buddy? I got the blank stare of the dairy cow in response. I signaled again, still no indication he was aware of his surroundings. I pointed to the up line and signaled for him to ascend. He stayed there flapping. My thought was, this guy is as good as dead if he doesnt get help quickly.
Immediately, I got my students attention and told her to put away the reel. Turning back to the flapper, I saw him moving farther away from the up line. Turning back to my student, I saw she had taken care of the reel and was looking at me for directions. Moving toward the flapper, I saw the DM arrive and take control (literally, he had him by the tank valve) and start up. I was then able to go back to working with my student.
The other guy panicked after they started down and the DM took him up, signaling to the flapper to come up with him. The flapper ignored this and went on a solo dive. As soon as he got the panicked guy on the boat, he went after the other.
My point is this could have turned out tragically. These guys are welcome to clean up the gene pool, but dont do it in a way that endangers other and dont do it on a commercial charter.